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When expressing "It takes about 1 hour and 15 minutes", would it be best to say
１時間１５分掛かる。
or
１時１５分掛かる。
or maybe
１時１５分間掛かる。
?
１時 means "one o'clock". １時間 means "one hour". So you have to say １時間１５分掛かる。 If you want to express the "about", you can say およそ１時間１５分掛かる。 or １時間１５分くらい掛かる。
